The IRAUDAMP1 Class D audio amplifier reference design from International Rectifier features the 200V-rated IR2011S high-speed gate driver IC, which drives a pair of IRFB23N15D HEXFET MOSFETs for each channel in the power stage to provide the amplified audio PWM (pulse width modulated) waveform. The reference design is a complete analog input, Class D audio power amplifier with 500W + 500W peak stereo output into four ohms. The IRAUDAMP1 is based on a self-oscillating PWM modulator for the lowest component count and a robust design, with protection functions and housekeeping power supplies to simplify use. This reference design is intended to demonstrate how to use the IR2011S, implement protection circuit features and design an optimum PCB layout. The IR2011 200V-rated high- and low-side MOSFET driver IC is designed for 100W-1000W Class D audio amplifier circuits. Housed in an 8-pin DIP or SO-8 package, it has a maximum ambient temperature rating of 125C, which improves safety margins compared to similar devices rated at 85C.